EP0088640A2 - Schiff mit Abgasleitung durch den Boden - Google Patents

Schiff mit Abgasleitung durch den Boden Download PDF

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Publication number
EP0088640A2
EP0088640A2 EP83301311A EP83301311A EP0088640A2 EP 0088640 A2 EP0088640 A2 EP 0088640A2 EP 83301311 A EP83301311 A EP 83301311A EP 83301311 A EP83301311 A EP 83301311A EP 0088640 A2 EP0088640 A2 EP 0088640A2
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EP
European Patent Office
Prior art keywords
vessel
recess
opening
exhaust gases
recessed portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP83301311A
Other languages
English (en)
French (fr)
Other versions
EP0088640A3 (de
Inventor
Akira Ikeda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0088640A2 publication Critical patent/EP0088640A2/de
Publication of EP0088640A3 publication Critical patent/EP0088640A3/de
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/32—Arrangements of propulsion power-unit exhaust uptakes; Funnels peculiar to vessels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
    • B63B1/34—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction
    • B63B1/38—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/10—Measures concerning design or construction of watercraft hulls

Definitions

  • This invention relates to a vessel, particularly a high speed boat, in which exhaust gas discharges through the vessel's bottom.
  • vessels have discharged exhaust gas into the atmosphere, and have consequently been required to install silencers, which are disadvantageous in that they reduce the power output and increase the weight of the vessel.
  • a vessel discharging exhaust gas through the ship's bottom was then developed, by the inventor of the present invention, and such a vessel will be described later.
  • the inventor then developed an improvement on the above arrangement which allows a reduction in the frictional resistance of the vessel's bottom and lift to be increased.
  • This improvement involved the provision of a central recess in the vessel's bottom, as will be described more fully later.
  • a vessel whose bottom comprises a recess having an opening through which exhaust gases can pass characterised in that there is provided a duct in the recess leading forward from the opening.
  • the duct preferably does not protrude beyond the recess so that drag is not adversely affected.
  • the duct may lie along a keel line of the vessel and is preferably of part-circular, for example semi-circular, section. An end of the duct remote -from the opening may open adjacent a step delimiting the recess.
  • a vessel whose bottom comprises a recess having an opening through which exhaust gases can pass characterised in that the recess comprises a relatively deeply recessed portion and a relatively shallowly recessed portion and in that the opening is situated in the relatively deeply recessed portion, which is astern of the relatively shallowly recessed portion.
  • a step may delimit the relatively deeply recessed portion from the relatively shallowly recessed portion and the step may run across the vessel, for example perpendicular to a keel line.
  • a vessel whose bottom comprises a recess having an opening through which exhaust gases can pass characterised in that a channel is provided around at least part of the recess.
  • the channel is preferably at least in part provided by a groove in the vessel's bottom, which groove may be adjacent the chine.
  • the channel preferably also extends across the vessel at the stern and traps or at least helps trap exhaust gases.
  • the channel may be formed at the stern and/ or at the vessel's sides by a flap.
  • a vessel whose bottom comprises a recess having an opening through which exhaust gases can pass, the vessel having a screw propeller, characterised in that a water flow guide is positioned in the recess and at least partially forward of the propeller.
  • the water flow guide serves to divert highly aerated or foaming water from the propeller and may by its shape serve to de-aerate, at least partially, water flowing past it.
  • the water flow guide may have a dove-tail or trapezium-like vertical section, with the shorter of the two parallel sides of the trapezium being adjacent the vessel's bottom.
  • the water flow guide is preferably positioned within the recess, for example within a relatively deeply recessed portion, and desirably does not protrude from the recess.
  • the water flow guide may be triangular, although the sides need not be straight. It is particularly preferred that the water flow guide possesses a plane of symmetry in which the axis of rotation of the propeller lies. In one embodiment the water flow guide is in the shape of an isosceles triangle in plan, and it may be in the shape of an equilateral triangle.
  • the invention also extends to a vessel in accordance with any two or more aspects of the invention.
  • Figures 1 and 2 show a prior vessel, in which the main exhaust pipe b of the engine a opens to the water through the vessel's bottom c near to the stern.
  • An auxiliary exhaust pipe d branches from the main exhaust pipe b and is open to the atmosphere for the discharge of exhaust gases when the vessel is stationary or moving slowly or going astern.
  • a groove e runs forward from the vessel's stern, and a wall f terminates the groove e at its deepest part.
  • a step h is thereby formed by the wall f in the main portion of the vessel's body g, and the main exhaust pipe b opens through the vessel's bottom c into the groove e near to the step h.' This arrangement is described. in J apanesePatent No. 932,781.
  • Figures 3 and 4 shows a known improvement of such a vessel.
  • main exhaust pipes b of a pair of engines a open into the water through a vessel's bottom c near to the stern.
  • Auxiliary exhaust pipes d branch from the exhaust pipes b and are open to the atmosphere.
  • a wall 3 terminates a recess 2 at the deepest part of the recess 2, which has a fixed width m along the keel line 1.
  • the wall 3 forms a step 5 in the vessel's bottom 4.
  • the main exhaust pipes b are both open to the recess 2 at a part 6 in the recess 2 which becomes filled with exhaust gas.
  • the main exhaust pipe b opens directly to a recess 2 by the side of the engine. However, it is desired instantly to dissipate exhaust gases up to the part 6 which is near the step 5 of the recess 2.
  • Figures 5 and 6 show an embodiment of the present invention, in which a main exhaust pipe b of an engine a is open to the water through the bottom of the vessel at an opening 10 near to the. stem.
  • a recess 2 is formd along the keel line 1, which gives r ise to a step 5 of constant depth between the recess 2 and the rest of the vessel's bottom 7 so that exhaust gases fill the recess 2.
  • a duct 12 is positioned such that one end 8 opens against a part 5' of the step 5, the part 5 being that part of the step 5 which is nearest to the bow.
  • the other end 9 of the duct 12 at point 11 which is that part of the opening 10 of the main exhaust pipe b nearest the bow.
  • the present invention allows an increase in lift in a short time and enables frictional resistance to be reduced. This enables the provision of a high speed vessel of improved acceleration, and the vessel width can be made relatively large because of the increase in lift. Resistance leading to wave formation may be reduced. A vessel in accordance with the present invention may therefore find application as a high-speed pleasure boat.
  • the recess 2 is formed with a second step 13 extending in a direction along the width of the recess 2.
  • the recess 2 is formed of a first portion 2 1 , which.is relatively shallowly recessed, and a second portion 2 2t which is relatively deeply recessed.
  • the duct 12 extends in the first portion 2 1 and the opening 10 of the main exhaust pipe b is at the forward edge of the second portion 2 2'
  • exhaust gas discharged from the opening 10 of the main exhaust pipe b rapidly disperses laterally, that is to say in the direction of the width of the recess 2. This reduces the area of the recess 2 in contact with the water and cuts down superficial water flow during acceleration from low speeds. Lift tends to increase in a shorter time during acceleration and greater acceleration may be achieved.
  • a first groove 14 is provided in a part 7 of the bottom around the recess 2.
  • the first groove 14 serves to reduce or prevent exhaust gas leakage from the recess 2.
  • a second groove 15 runs across the bottom at the stern.
  • the second groove 15 also serves to reduce or prevent exhaust gas leakage from the recess 2.
  • Figure 10 (a) shows how the second groove may be provided as being formed in the bottom itself
  • Figure 10(b) shows how the second groove 15 may be provided under a flap 16 a little above the bottom of a transom 17 at the stern of the vessel.
  • transverse flow component is inhibited by means of the first groove 14, so an area of increased pressure is developed along the first groove 14. As a result, any leakage of exhaust gas is effectively prevented. It should be noted that the transverse flow -component is produced not only during acceleration but also during crusing at a constant speed.
  • the first groove 14 which is installed near the chine of the vessel, serves to change dynamic pressure resulting from this flow into static pressure, which gives rise to a high pressure region along the chine and prevents the leakage of exhaust gas.
  • the second groove 15 formed at the stern aft of a surface past which water flows relatively as shown in Figure. lOCal.
  • the second groove 15 formed by the flap 16 as shown in Figure 10(b).
  • Dynamic pressure resulting from flow in this region is similarly converted to static pressure thereby forming a high-pressure region at the stern and preventing leakage of exhaust gas.
  • an air- cushion effect can be obtained using the exhaust gas of the engine.
  • This tends to be more economical than a hovercraft, which uses power to drive a lifting fan.
  • the weight of the vessel can be reduced and the vessel can be operated using less power for a given speed and loading capacity, and generates less wave resistance when compared with a hovercraft, because of resemblance of-the hull to a conventional high speed vessel.
  • the vessel is not equipped with a skirt as is required in the case of a hovercraft, thus resulting in the elimination of expense and time for skirt maintenance and repair, and has resistance characteristics at high speeds identical to those of a conventional stepped sliding boat, that is to say a planning boat with a transversely extending step formed across its bottom.
  • a vessel in accordance with the present invention does not need such a large engine as a stepped boat, because it does not have such a steeply increasing range of resistance under acceleration.
  • Figure 5 shows the Designed Water Line (DWL) of the boat (that is,the water line determined when designing the boat) and the Planing Water Line (PWL) (that is, the water line during planing motion.
  • DWL Designed Water Line
  • PWL Planing Water Line
  • a vessel in accordance with the present invention is provided with a screw propeller 18, which is driven, by the engine, near the end of the recess 2.
  • a projecting sliding surface or water flow guide in the shape of an isosceles triangle 20 to the upstream side of the propeller 18 in the recess 2.
  • the triangle 20 has a vertex 19 to the bow side, and a trapezium- shaped dove-tail section along a line parallel to the base of the isosceles triangle 20, as is shown in Figures 8 and 9.
  • the graph of Figure 11 shows how speed (along the x-axis) varies with effective horse power (along the y-axis) for a prior vessel (upper line) and a vessel in accordance with the present invention (lower line). Both vessels displace 30 tons ( tonnes) and have a length of 8 m at the water line and a breadth of 2.5 m at the water line. It can be seen that, to achieve a speed of 35 knots (18 m/s), the prior vessel must develop an effective power of 130 horse power (97 kw), whereas the vessel in accordance with the present invention need only develop an effective power of 70 horse power (51 kw).
  • the transport efficiency of a passenger vessel may be calculated by the following equation:
  • the transport efficiency was about 1.5 to 2.0; however, a vessel in accordance with this invention could develop 30.8 knots (16 m/s) with a load of 30 personnel with an engine developing 206 HP (154 kw). The transport efficiency was very high at about 4.4.9.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Exhaust Silencers (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP83301311A 1982-03-09 1983-03-09 Schiff mit Abgasleitung durch den Boden Withdrawn EP0088640A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP35747/82 1982-03-09
JP57035747A JPS58152699A (ja) 1982-03-09 1982-03-09 船底排気式高速艇

Publications (2)

Publication Number Publication Date
EP0088640A2 true EP0088640A2 (de) 1983-09-14
EP0088640A3 EP0088640A3 (de) 1984-11-21

Family

ID=12450405

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83301311A Withdrawn EP0088640A3 (de) 1982-03-09 1983-03-09 Schiff mit Abgasleitung durch den Boden

Country Status (8)

Country Link
US (1) US4509927A (de)
EP (1) EP0088640A3 (de)
JP (1) JPS58152699A (de)
KR (1) KR880002206B1 (de)
AU (1) AU1200383A (de)
BR (1) BR8301077A (de)
CA (1) CA1191742A (de)
NO (1) NO157011C (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0282462A1 (de) * 1987-03-10 1988-09-14 Mario Amati Unterwasserauspuffgerät für Motorboote
EP0341359A1 (de) * 1988-05-13 1989-11-15 Leonard Jefferson Blee Bootskörper
WO1995007210A1 (fr) * 1993-09-08 1995-03-16 Tovarischestvo S Ogranichennoi Otvetstvennostju 'bjuro Skorostnykh Sudov' Bateau rapide
WO1995014604A1 (en) * 1993-11-29 1995-06-01 Sea Flight Pty. Ltd. Vessel having a high-speed planing or semi-planing hull
US5719358A (en) * 1994-08-12 1998-02-17 Ingenjorsfirma Jan Lindholm Ab Arrangement for muffling the exhaust sound of a boat motor
EP2036812A3 (de) * 2006-05-24 2009-05-27 DK Group N.A. N.V. Lufthohlraumwasserfahrzeug

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3442044A1 (de) * 1984-11-16 1986-05-28 Wolfgang 2000 Hamburg Mangelsdorf Katamaran-luftkissenwasserfahrzeug
US4699596A (en) * 1987-02-13 1987-10-13 Klinker Ronald D Modified jet ski nozzle
NZ225031A (en) * 1987-06-16 1990-04-26 Haines John S Planing boat hull, stepped recess vented to atmosphere
US5191853A (en) * 1991-05-24 1993-03-09 Adler Alan John Stepped hydroplane hull
US5505644A (en) * 1995-01-18 1996-04-09 Ray Industries, Inc. Submerged marine exhaust system
JPH0986495A (ja) * 1995-09-20 1997-03-31 Tanaka Zosen:Kk 船
US5700172A (en) 1996-01-18 1997-12-23 Ray Industries, Inc. Submerged marine exhaust system
USD384321S (en) * 1996-06-19 1997-09-30 Anderson Carl J Boat hull
US5833502A (en) * 1996-06-19 1998-11-10 Anderson; Carl J. Boat construction
US5980343A (en) * 1997-03-05 1999-11-09 S2 Yachts Inc. Exhaust system for marine vessels
US6066014A (en) * 1998-08-17 2000-05-23 Polaris Industries Inc. Small watercraft exhaust device
GB9905427D0 (en) 1999-03-09 1999-05-05 Duncan Ian J Hull for high speed water craft
KR20030006172A (ko) * 2001-07-11 2003-01-23 박광수 수중 모터 스키
EP1361151A1 (de) * 2002-05-07 2003-11-12 DK Group N.A. N.V. Schiff mit luftgefüllten Hohlräumen am Bodem und mit Luftdeflektoren
DE10258495B4 (de) * 2002-12-14 2007-03-01 Buchert, Jürgen Reibungsreduktionsantrieb für Wasserfahrzeuge mittels Turbine
NL1022862C2 (nl) * 2003-03-06 2004-09-07 Josephus Marinus Hansen Vaartuig.
US7806064B2 (en) * 2008-03-12 2010-10-05 Wellman John G Friction reducing pollution control system for marine vehicles
US20100041288A1 (en) * 2008-08-12 2010-02-18 Woodrow Woods Submerged exhaust discharge for marine vessel
JP2016124453A (ja) * 2015-01-06 2016-07-11 株式会社E・C・R 滑走艇
US10793228B2 (en) 2016-12-02 2020-10-06 Polaris Industries Inc. Structure and assembly for recessed deck portion in pontoon boat
DE102017101055B4 (de) 2017-01-20 2021-05-06 Mike René Wilke Motorbetriebenes wasserfahrzeug und verfahren zur reduktion der reibung an schiffsrümpfen
US11192610B2 (en) 2019-10-30 2021-12-07 Polaris Industies Inc. Multiple chine pontoon boat

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB162916A (en) * 1920-05-04 1921-05-12 Harold Edgar Yarrow Improvements in hydroplanes
US3125977A (en) * 1964-03-24 Apparatus for reducing the wave making resistance for boats
US3331347A (en) * 1964-06-23 1967-07-18 Heidenstam Erik Johan Von Boats comprising means for introducing air to submerged portions of the boat bottom
US4165703A (en) * 1976-11-01 1979-08-28 Burg Donald E Air ride boat hull
FR2460242A1 (fr) * 1979-07-04 1981-01-23 Vallas Georges Bateau aeroglisseur
GB2065036A (en) * 1979-12-12 1981-06-24 Henwood M R Improvements in or relating to exhaust systems and/or boat hulls
JPS5686891A (en) * 1979-12-17 1981-07-15 Akira Ikeda Underwater exhaust high speed boat

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1003364A (en) * 1907-08-17 1911-09-12 Frederick B Langston Boat construction.
US1069945A (en) * 1912-04-03 1913-08-12 Wesley F Hall Under-water exhaust and muffler.
US1737180A (en) * 1927-09-01 1929-11-26 James E Walls Speed boat
US1766360A (en) * 1928-12-15 1930-06-24 Alexander C Schipper Boat
US2450665A (en) * 1945-01-08 1948-10-05 William B Jutte Concave hydroplane hull

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125977A (en) * 1964-03-24 Apparatus for reducing the wave making resistance for boats
GB162916A (en) * 1920-05-04 1921-05-12 Harold Edgar Yarrow Improvements in hydroplanes
US3331347A (en) * 1964-06-23 1967-07-18 Heidenstam Erik Johan Von Boats comprising means for introducing air to submerged portions of the boat bottom
US4165703A (en) * 1976-11-01 1979-08-28 Burg Donald E Air ride boat hull
FR2460242A1 (fr) * 1979-07-04 1981-01-23 Vallas Georges Bateau aeroglisseur
GB2065036A (en) * 1979-12-12 1981-06-24 Henwood M R Improvements in or relating to exhaust systems and/or boat hulls
JPS5686891A (en) * 1979-12-17 1981-07-15 Akira Ikeda Underwater exhaust high speed boat

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 5, no. 162(M-92)(834), 17th October 1981; & JP-A-56 086891 (AKIRA IKEDA) 15-07-1981 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0282462A1 (de) * 1987-03-10 1988-09-14 Mario Amati Unterwasserauspuffgerät für Motorboote
EP0341359A1 (de) * 1988-05-13 1989-11-15 Leonard Jefferson Blee Bootskörper
WO1995007210A1 (fr) * 1993-09-08 1995-03-16 Tovarischestvo S Ogranichennoi Otvetstvennostju 'bjuro Skorostnykh Sudov' Bateau rapide
WO1995014604A1 (en) * 1993-11-29 1995-06-01 Sea Flight Pty. Ltd. Vessel having a high-speed planing or semi-planing hull
AU668665B2 (en) * 1993-11-29 1996-05-09 Sea Flight Pty Ltd Vessel having a high-speed planing or semi-planing hull
US5719358A (en) * 1994-08-12 1998-02-17 Ingenjorsfirma Jan Lindholm Ab Arrangement for muffling the exhaust sound of a boat motor
EP2036812A3 (de) * 2006-05-24 2009-05-27 DK Group N.A. N.V. Lufthohlraumwasserfahrzeug

Also Published As

Publication number Publication date
EP0088640A3 (de) 1984-11-21
NO157011C (no) 1988-01-06
AU1200383A (en) 1983-09-15
CA1191742A (en) 1985-08-13
KR840003486A (ko) 1984-09-08
BR8301077A (pt) 1983-11-22
JPH026678B2 (de) 1990-02-13
KR880002206B1 (ko) 1988-10-18
US4509927A (en) 1985-04-09
JPS58152699A (ja) 1983-09-10
NO157011B (no) 1987-09-28
NO830807L (no) 1983-09-12

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